L. sativae minor damage
Liriomyza sativae mainly infects vegetables such as cucumber, tomato, eggplant, pepper, cowpea, celery, melon, watermelon, wax gourd, gourd, zucchini, and Chinese cabbage. Recently, it was investigated that L. sativae is endangered on a variety of vegetables. If it does not take precautions, it will seriously affect the yield and quality. First, the characteristics of damage Adults and larvae can all be harmed. The larvae infiltrate into the leaves, and in the mesophyll tissue between the epidermis and the lower epidermis, produce a white insect pathway that is thin and irregularly serpentinely curved or coiled. The insects in the insect pathway are alternately arranged in order. It is generally an insect, and the mature larvae sneak about 3 cm a day. Adults feed on the front of the leaf, female adult insects lay on the leaves of the plant to form a sting wound "hole" with a round tip size. The stabbed "hole" is light green at first and white afterwards. It can be observed with naked eyes. After the leaves are damaged, the chlorophyll is destroyed, which affects the photosynthesis and causes the plants to grow slowly and stunted. When the larvae in the leaves are long, white worms connect together, causing the entire leaf to become white and fall off. When the humidity is high, the leaves rot and seriously destroy the seedlings. Adult cross-feeding can also spread diseases. Second, the characteristics of occurrence The population of Liriomyza sativae is short in generations and its reproduction ability is strong. It occurs over a dozen generations a year. It can develop at 12°C-35°C, but it is slow to develop at less than 20°C. Low temperature is also harmful to pupation. Usually about 54 days at 15°C, one generation at generation, about 16 days at 20°C, and about 12 days at 30°C. Rainfall can also affect the occurrence of Liriomyza sativae, especially after heavy rains, it can kill some adults and slugs. Third, control methods The adults of Liriomyza sativae are smaller and often not found by humans. The larvae are also harmed in the leaves. They have poor efficacy in drug control and have strong resistance to drugs. They cause great difficulties in prevention and control. Comprehensive prevention and control strategy. 1. Implement reasonable rotations of vegetables, crucifers, liliaceae, and other unwelcome vegetables, such as melons and legumes and legumes. 2. Before vegetables were planted in early spring and autumn, weeds, stubbles, and leaves were completely removed from the vegetable fields, and burned to reduce the source of insects. 3. According to the characteristics of the mature larvae of Liriomyza sativae growing out of the foliage or falling into the soil, before or during sowing, the water can be used to flood the soil or turn the soil frequently to eliminate some insects. 4. At the initial stage of insect infestation and when transplanting seedlings and transplanting, the insect leaves were removed and the leaf larvae were killed, which can better control the growth of insects. 5. According to the yellowish habits of Liriomyza, yellow plates are used to kill adult Liriomyza sativae. In vegetable gardens, greenhouses, greenhouses and other facilities, hang waste fibreboard or cardboard (1m 0.2m) painted on both sides with yellow paint. Apply a layer of viscous oil every 5-7 days (add a little bit of oil and mix with 10th motor oil) , several times in a row. 25-30 pieces per mu, placed between rows, can be slightly higher than the plant height. 6. Scientific medication. In the event of serious occurrence of Liriomyza sativae Blanco, the use of pesticides that are systemic, efficient and safe for chemical control. It is advisable to control the larvae before 2nd age (when the worm tract is very fine), 1.8% avermectin EC 3000 times, 1.8% Qishen EC 3,000 times, 5% TAIPO EC 2000 times, 5 % Cascade Emulsion 2000 times, 50% Chloromicin Water Soluble Powder 2500-3500 Times, 52.25% Farmland Emulsion 1000 times or 10% Imidacloprid wettable powder 1000 times spray control. Prevention and control time is good at 8-12 when the adult emergence peaks. Application interval is 4-6 days. The above drug rotations are used alternately to avoid drug resistance. Note that the vegetables are not sprayed before picking, and should be picked and marketed after the pesticide residue period expires.
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